Why do some quasars have redshifts greater than 1?
A)They are made of different elements than any other objects in the universe.
B)They are very distant, with relativistic redshifts that take into account dilation of space-time,as Einstein predicted.
C)They are made of tachyons and thus are able to move away from us faster than the speed oflight.
D)Einstein proved it is impossible to have a redshift greater than 1; these are all due togravitational lensing tricking us.
E)They are moving towards us, which throws off our spectrometers.

Question

Quizplus · Accepted Answer

Quasars with redshifts greater than 1 are very distant and their light is shifted to longer wavelengths due to the expansion of the universe, as predicted by Einstein's theory of relativity. This effect, known as relativistic redshift, takes into account the dilation of space-time and can cause a redshift greater than 1. Quasars with redshifts greater than 1 are very distant, and their redshifts take into account the dilation of space-time as predicted by Einstein's theory of relativity. This means that the light emitted by these objects has traveled through an expanding universe for a longer time, causing a larger redshift.

Why Do Some Quasars Have Redshifts Greater Than 1